JPH08100908A - Catalytic combustion device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a catalytic combustion device capable of efficiently transferring the heat of the combustion cylinder to the blown air, preventing the catalyst from overheating in the combustion cylinder, and improving the combustion efficiency. . According to the present invention, a premixing unit 5 that uniformly mixes fuel and air to form a mixed gas, a supply unit 7 that supplies fuel and air to the premixing unit 5, and a premixing unit 5 are formed. The combustion cylinder 9 into which the mixed gas is introduced, a plurality of catalysts 11 and 13 arranged in multiple stages in the combustion cylinder 9 to perform a combustion reaction with the mixed gas, and the combustion of the catalysts 11 and 13 and the mixed gas A catalytic combustion device 1 having a blowing means 15 for blowing the combustion reaction heat released by the reaction to the combustion cylinder 9 to generate warm air.
In the above, the combustion cylinder 9 is arranged in the air flow path of the blower means 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalytic combustion device for catalytically burning fuel gas or a mixed gas of fuel and air to generate warm air, and more particularly to a forced circulation type oil heating device using kerosene as fuel. The present invention relates to a suitable catalytic combustion device.

[0002]

2. Description of the Related Art A catalytic combustion device for catalytically burning a mixed gas of combustion and air to generate hot air includes a premixing section, a supply means for supplying fuel and air to the premixing section, and a premixing section. And a combustion cylinder into which the formed mixed gas flows. A catalyst that burns and reacts with the mixed gas is arranged in the combustion cylinder. Further, the catalytic combustion device is provided with an air blowing unit that turns the combustion reaction heat released during catalytic combustion in the combustion cylinder into warm air.

The premixing section is provided with a vaporizer having a heater that generates heat when energized, and heats the supplied fuel to vaporize it. In addition, combustion air is supplied to the premixing unit and mixed with vaporized fuel to form a mixed gas.

When the operation of the catalytic combustion device is started, the fuel gas vaporized by the vaporizer is mixed with the supplied combustion air to form a mixed gas. This mixed gas flows into the combustion cylinder and comes into contact with the catalyst for combustion reaction. The heat of combustion reaction is released by the combustion reaction between the catalyst and the mixed gas. This heat is turned into warm air by the blowing means and supplied to the room or the like.

[0005]

By the way, in order to heat the combustion reaction heat into warm air by the air blowing means, air is blown by the air blowing means in the vicinity of the outer periphery of the combustion cylinder which is raised by the heat released by the combustion reaction. Then, the temperature of this air is raised to make it warm air.

At this time, if the heat in the combustion cylinder cannot be efficiently transferred to the blown air, the temperature in the combustion cylinder rises and the temperature of the catalyst overheats, and the deterioration of the catalyst due to heat is promoted to burn. There is a problem of reduced efficiency.

In view of the above circumstances, the present invention efficiently transfers the heat of the combustion cylinder to the blown air to prevent the catalyst in the combustion cylinder from overheating and improve the combustion efficiency. The purpose is to provide a combustion device.

[0008]

In order to achieve the above object, the invention according to claim 1 is formed by a premixing section for uniformly mixing fuel and air to form a mixed gas, and a premixing section. A combustion cylinder into which the mixed gas flows, a catalyst that separates the premixing unit from the combustion cylinder and is arranged in the combustion cylinder, through which the mixed gas can flow, and a control that controls the amount of heat generated by the reaction of the catalyst And means.

The invention according to claim 2 is the invention according to claim 1, wherein the control means obtains warm air by exchanging heat with the indoor air from the combustion gas burned in the combustion cylinder by catalytic reaction. It is characterized in that a part of the blown air of the blower means is used.

According to a third aspect of the present invention, a premixing section that uniformly mixes fuel and air to form a mixed gas, a combustion cylinder into which the mixed gas formed by this premixing section flows, and this combustion A plurality of stages of catalysts which divide the cylinder and the premixing section and are arranged in the combustion cylinder and through which the mixed gas can flow; and a control means for controlling the amount of heat generated by the reaction between the catalysts. Is characterized by.

The invention according to claim 4 is the invention according to claim 3, wherein the control means obtains warm air by exchanging heat with the indoor air from the combustion gas burned in the combustion cylinder by catalytic reaction. It is characterized in that a part of the blown air of the blower means is used.

The invention according to claim 5 is the invention according to claim 3 or 4, characterized in that a fin for heat radiation is provided between a plurality of stages of catalysts in a direction perpendicular to the reaction surface of the catalyst. There is.

The invention according to claim 6 is the invention according to claim 3 or claim 4, characterized in that heat-dissipating fins inclined with respect to the reaction surface of the catalyst are provided between a plurality of stages of catalysts. There is.

The invention according to claim 7 is the invention according to any one of claims 1 to 4, wherein the fins for heat radiation are provided on the outer periphery of the combustion cylinder and perpendicular to the combustion reaction surface of the catalyst. It is characterized by the provision of.

The invention according to claim 8 is the invention according to any one of claims 1 to 4, wherein a heat-radiating fin parallel to the combustion reaction surface of the catalyst is provided on the outer periphery of the combustion cylinder. It is characterized by that.

The invention according to claim 9 is the invention according to any one of claims 1 to 4, characterized in that a heat transmission plate is provided on the outer peripheral surface of the combustion cylinder between the catalysts. I am trying.

The invention according to claim 10 is the invention according to any one of claims 1 to 4, wherein at least the combustion cylinder between the catalysts is formed of a heat permeable material. I am trying.

The invention according to claim 11 is the invention according to claim 10, characterized in that the catalyst is formed in a mountain-shaped cross section with a central portion protruding toward the downstream side in the flow direction of the mixed gas. There is.

[0019]

According to the first aspect of the invention, the heat of combustion of the combustion reaction released by the combustion reaction of the catalyst and the mixed gas is controlled by the control means. Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the second aspect of the present invention, the heat of combustion reaction released by the combustion reaction of the catalyst and the mixed gas is controlled by using a part of the blown air of the blower means. Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the third aspect of the present invention, the heat generation amount of the combustion reaction heat released by the combustion reaction of the catalyst and the mixed gas in a plurality of stages is controlled by the control means. Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the invention described in claim 4, the heat of combustion reaction released by the combustion reaction of the catalyst and the mixed gas is controlled by using a part of the blown air of the blower means. Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the fifth aspect of the invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat to the air can be transferred. The amount of heat transfer increases. Moreover, the heat in the combustion cylinder can be effectively transferred to the combustion cylinder by the heat radiation fins arranged between the catalysts, and the catalyst in the combustion cylinder does not overheat.

According to the sixth aspect of the invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat can be transferred to the air. The amount of heat transfer of is increased. Further, the heat radiation inside the combustion cylinder can be effectively transferred to the combustion cylinder by the heat radiation fins arranged between the catalysts. Moreover, since the fins for heat radiation are inclined, a swirl flow is generated in the flow of the mixed gas, and the mixed gas can be distributed substantially uniformly on the reaction surface of the catalyst.

According to the invention described in claim 7, by disposing the combustion cylinder in the air flow path of the blowing means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and The amount of heat transfer increases. Further, by providing a heat radiation fin perpendicular to the reaction surface of the catalyst on the outer circumference of the combustion cylinder, the heat in the combustion cylinder can be effectively transferred to the combustion cylinder, and the heat is blown to the outer circumference of the combustion cylinder. Heat can be efficiently transferred to the air.

According to the invention described in claim 8, by disposing the combustion cylinder in the air flow path of the blowing means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat can be transferred to the air. Heat transfer is increased. Further, by providing a heat radiation fin parallel to the reaction surface of the catalyst on the outer circumference of the combustion cylinder, heat can be efficiently transferred to the air blown to the outer circumference of the combustion cylinder.

According to the ninth aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blowing means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat can be transferred to the air. Heat transfer is increased. Further, the heat transmitting plate provided on the outer peripheral surface of the combustion cylinder radiates the heat of the combustion cylinder to the outside as radiant heat. Therefore, a large amount of heat in the combustion cylinder can be released to the outside.

According to the tenth aspect of the invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat can be transferred to the air. Heat transfer is increased. Further, by forming the combustion cylinder with a heat-permeable material, the heat of the combustion cylinder is released to the outside as radiant heat. Therefore, a large amount of heat in the combustion cylinder can be released to the outside.

According to the eleventh aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blowing means, it is possible to efficiently transfer the heat of the combustion cylinder to the blown air, and to the air. Heat transfer is increased. In addition, by forming the combustion cylinder with a heat permeable material, the heat of the combustion cylinder is released to the outside as radiant heat, and the heat of the combustion cylinder can be efficiently transmitted to the blown air. Furthermore, by forming the catalyst in a mountain shape in cross section with the central portion protruding toward the downstream side in the flow direction of the mixed gas, the radiant heat from the combustion cylinder to the outside increases, and the heat of the combustion cylinder is efficiently transferred to the air. Can be communicated.

[0030]

Embodiments of the catalytic combustion apparatus according to the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 shows a catalytic combustion device 1 of the first embodiment. The catalytic combustion device 1 includes a premixing unit 5 that forms a mixed gas of fuel and air, a supply unit 7 that supplies fuel and air to the premixing unit 5, and a mixing unit formed by the premixing unit 5. It has a combustion cylinder 9 into which gas flows. Further, the catalytic combustion device 1 is
Combustion reaction by combustion reaction of the upstream catalyst 11 arranged in the combustion cylinder 9, the downstream catalyst 13 arranged above the upstream catalyst 11, the upstream catalyst 11 and the downstream catalyst 13 and the mixed gas. It has a blower means 15 for blowing heat to the combustion cylinder 9 to turn it into warm air. Further, in this embodiment, the combustion cylinder 9 is arranged in the air flow path of the blower means 15. Further, the present embodiment has a control means for controlling the amount of heat generated by the reaction of the catalysts 11 and 13. This control means is configured to use a part of the blown air of the blower means 15 for obtaining warm air by exchanging heat with the indoor air from the combustion gas burned in the combustion tube 9 in the combustion reaction.

The premixing section 5 comprises a vaporizer for vaporizing the fuel, and a cover 19 for covering the vaporizer and forming a premix chamber (not shown) between the vaporizer and the vaporizer.
A heater is provided in the central portion of the vaporizer, and a mixing passage communicating with the oil feed pipe 23 is formed around the heater. A blast passage communicating with the blast pipe 27 is formed around the mixing passage. The air passage and the mixing passage are communicated with each other through a plurality of openings. In addition, a nozzle that opens toward the premix chamber is formed at the upper end of the mixing passage.

The premixing section 5 is fixed to a base section 59 which divides the inside of the main body case 53 into an upper chamber 55 and a lower chamber 57. The upper part of the vaporizer is provided so as to project into the combustion cylinder 9 and is covered with an upper cover 33. This top cover 3
3 is provided with a plurality of inlets 35 that connect the premix chamber and the inside of the combustion cylinder 9.

The fuel sent to the premixing section 5 is vaporized by the heater to become fuel gas, which is uniformly mixed with the supplied air and flows into the combustion tube 9 through the inlet 35 of the upper cover 33. . Fuel and air are supplied to the premixing unit 5 by the supply unit 7.

The supply means 7 comprises a fuel supply section 37 and an air supply section 39. The fuel supply unit 37 includes a fuel tank 41.
And an oil feed pipe 23 communicating with the mixing passage 25, and a fuel pump 45 provided in the oil feed pipe 23. By the operation of the fuel pump 45, fuel (kerosene) is sent from the fuel tank 41 to the premixing section 5 through the oil feed pipe 23. The air supply unit 39 includes a fan 47 and a blower pipe 27, and a heater 51 is provided in the middle of the blower pipe 27. Then, by the operation of the fan 47, the air is sent to the premixing section 5 through the blower pipe 49. In this case, the sent air is heated by the heater 51. The fuel and air sent in are in the premixing section 5
Are mixed with each other and flowed into the combustion cylinder 9.

The combustion cylinder 9 is arranged in the combustion chamber 61. The combustion chamber 61 is formed by partitioning an upper chamber 55 with a blower chamber 65 by a wall 63. The combustion cylinder 9 includes a cylinder body 67 fixed on the base portion 59, and an exhaust cylinder 69 connected to an opening 67a above the cylinder body 67. Cylinder 6
An upstream side catalyst 11 and a downstream side catalyst 13 are arranged in two stages at predetermined intervals in the middle of the height direction of 7. Further, a heat transmission plate 70 is provided on the cylindrical body 67 between the catalysts 11 and 13. Further, a space is formed between the catalysts 11 and 13 so that the mixed gas that has passed through the upstream side catalyst 11 rises in a natural flow. Further, a temperature detector 71 is arranged between the catalysts 11 and 13 so that the temperature is constantly detected.

The catalysts 11 and 13 are formed by supporting a catalyst layer by coating or the like on the surface of a metal carrier such as stainless steel. The carrier is formed in a honeycomb structure having openings on the upstream side and the downstream side in the flow direction of the mixed gas, and the mixed gas flows upward in each cell of the honeycomb structure. The catalyst layer is formed by adhering a noble metal (for example, palladium), which does not easily deteriorate even at high temperatures, to the surface of alumina particles. Then, when the mixed gas flows in the vicinity of the catalyst layer, methane gas and oxygen in the mixed gas are adsorbed by the noble metal and react with each other to generate carbon dioxide and water (steam) and release reaction heat.

Then, the temperature of the combustion cylinder 9 rises due to the reaction heat released by the combustion reaction of the mixed gas with the upstream side catalyst 11 and the downstream side catalyst 13, and the blowing means 1 is added to the combustion cylinder 9.
The air taken in by 5 is blown.

The blower means 15 comprises an air intake port 75 provided on the back wall 73 of the main body case 53, a convection fan 77 fixed to the back wall 73, and an air inlet 79 provided on the wall portion 63. By the rotation of the convection fan 77, air is taken into the main body case 53 from the air intake port 75 and flows into the combustion chamber 61 from the air inflow port 79 (in FIG. 1, an air flow path is indicated by an arrow). The combustion cylinder 9 described above is arranged in this air flow path. And the combustion chamber 6
The air that has flowed into the inside 1 is blown by the convection fan 77 to the combustion cylinder 9 whose temperature has risen due to the reaction heat, becomes warm air, and is supplied from the outlet 81 to the inside of the room. FIG.
In the figure, reference numeral 72 denotes a heat transmission plate attached to the front surface side of the main body case 53.

Next, the operation of the catalytic combustion device 1 will be described. When the operation of the catalytic combustion device 1 is started, the fan 47 operates, and at the same time, the preheating heater 51 is energized to raise the temperature of the air in the blower pipe 27. The air whose temperature has risen passes through the premixing section 5, is sent into the combustion cylinder 9, and passes through the upstream side catalyst 11. As a result, the upstream catalyst 11
Temperature begins to rise. Meanwhile, the surface temperature of the upstream catalyst 11 is detected by the temperature detector 71.

At the same time, the heater of the vaporizer is energized to heat the vaporizer. When the temperature of the carburetor reaches the optimum temperature and the surface temperature of the upstream side catalyst 11 becomes 400 ° C. or higher, the fuel pump 45 is started to supply the fuel from the fuel tank 41 into the carburetor. The fuel supplied into the vaporizer is heated by the heater and vaporized into fuel gas. This fuel gas, together with the air supplied by the fan 47 and heated by the heater 51, is sent into the premixing section 5 and uniformly mixed, and then flows into the combustion cylinder 9 from the inlet port 35 of the upper cover 33. To be done. Then, it comes into contact with the upstream side catalyst 11 which has been preheated to the activation temperature to cause a combustion reaction, generate carbon dioxide and water, and release reaction heat. This heat of combustion reaction is transferred to the combustion cylinder 9, and the air taken in by the convection fan 77 is blown to the combustion cylinder 9 to become warm air, which is blown out from the blowout port 81.

According to the catalytic combustion apparatus 1 of this embodiment, the combustion cylinder 9 is arranged in the air flow path of the blower means 15, so that the amount of air blown to the combustion cylinder 9 is increased and the combustion cylinder 9 is changed to air. The heat transfer is effectively performed to increase the heat transfer. As a result, overheating inside the combustion cylinder 9 can be prevented, and the temperatures of the catalysts 11 and 13 arranged inside the combustion cylinder 9 can be lowered without overheating. Therefore, the combustion range is expanded and the combustion efficiency for one catalyst is increased.

That is, in FIGS. 2 (a) and 2 (b),
From the durability of the catalyst, at the catalyst temperature of 800 ° C or lower, in order to prevent the bad odor generated by unburned components in the room,
Since it is preferable to burn at a concentration of 10 rpm or less, the hatched portion in the figure is a good combustion range of the catalyst. Increasing the air volume of the fan 77 lowers the catalyst temperature, so that the combustion range is expanded. Moreover, since the heat generated from the combustion cylinder can be released into the room by convection, the room temperature can be efficiently raised.

Therefore, the combustion range can be expanded by arranging the combustion cylinder 9 in the air flow path and increasing the air volume to the combustion cylinder 9.

Further, according to the present embodiment, the heat transmission plate 70 is provided in a part of the combustion tube 9 and the heat transmission plate 72 is also provided in a part of the main body case 53, so that the heat in the combustion tube 9 is removed. Since not only the transmission but also the radiation can be released to the outside, the temperature in the combustion cylinder 9 can be lowered more efficiently.

Further, according to this embodiment, the upstream catalyst 11
Since the carburetor and the carburetor are arranged at positions facing each other, the radiant heat from the reaction surface of the upstream side catalyst 11 which has started the combustion reaction and has become high temperature is efficiently taken into the carburetor, so Can be raised. As a result, the amount of electricity supplied to the carburetor can be reduced, and the power consumption can be reduced.

Further, according to this embodiment, two
By arranging the individual catalysts 11 and 13 at a predetermined distance along the flow direction of the mixed gas and sealing the space between these catalysts 11 and 13, a simple structure can be achieved, and the size of the heating appliance can be reduced. It will be possible. In addition, the simple structure simplifies the manufacturing process.

Furthermore, according to the present embodiment, the temperature of the catalyst is not excessively raised, so that the catalyst can be extended in life without accelerating the thermal deterioration of the catalyst.

Further, since the catalysts 11 and 13 are hermetically sealed, it is not necessary to supply the secondary combustion air between the catalysts 11 and 13, so that it is necessary to control the supply amount of the secondary combustion air. The amount of combustion can be adjusted only by controlling the amounts of fuel and combustion air supplied to the premixing unit 5, and the control becomes easy.

Further, by stacking the two catalysts 11 and 13 in two stages, the area of each catalyst 11 and 13 can be reduced, so that an unstable combustion state at a low combustion amount can be prevented. It is possible to obtain stable combustion. Further, since the two catalysts 11 and 13 have a large area, it is possible to burn up to a high combustion amount. Therefore, it has a wide heating variable width.

Since small catalysts are laminated,
Even if the supply amount of the mixed gas is low during low combustion, the temperature does not drop and unevenness does not occur, and stable combustion can be performed, resulting in clean exhaust gas.

Further, in the above embodiment, since the catalysts 11 and 13 are formed in the honeycomb structure, the natural flow of the mixed gas can be rectified, the temperature distribution has no unevenness, and stable combustion is performed. And this also
It can emit clean exhaust gas.

Next, a modification of the first embodiment will be described with reference to FIG. The catalytic combustion device 85 of this embodiment is an example in which the upstream side catalyst 87 is a conductive self-heating type catalyst.
The other structure is the same as that of the above-mentioned embodiment, and the description thereof is omitted.

As shown in FIG. 3, one end of an electrode 89 is connected to the downstream catalyst 13 side of the upstream catalyst 11 facing the premixing section 5. The other end of the electrode 89 is drawn to the outside of the cylindrical body 67 and connected to a power source (not shown). Further, the catalytic combustion device 85 of this embodiment is provided with the blower pipe 27.
There is no heater inside.

When the operation of the catalytic combustion device 85 is started, the fan 47 is operated and the upstream side catalyst 87 is energized. At the same time, the heater of the carburetor is also energized. The surface temperature of the upstream catalyst 85 is the temperature detector 7
1, when the temperature exceeds the activation temperature (400 ° C.) and the heater of the carburetor reaches the optimum temperature, the fuel pump 45 is operated to supply the fuel to the premixing unit 5. Then, the premixing unit 5 uniformly mixes the fuel and the air to form a mixed gas. This mixed gas flows into the combustion cylinder 9 and undergoes a combustion reaction with the upstream catalyst 85.

This modification also has the same effect as that of the above-described embodiment, and the heat transfer from the combustion tube 9 to the air is increased by disposing the combustion tube 9 in the air flow path of the blower means 15. . As a result, the temperatures of the catalysts 11 and 13 arranged inside the combustion cylinder 9 can be lowered, so that the combustion range is expanded and the combustion efficiency for one catalyst is increased.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. In the catalytic combustion device 91 of the second embodiment, the combustion cylinder 9 is arranged in the air flow path of the fan 77, and the catalysts 11 and 13 are arranged.
This is an example in which a heat radiation fin 93 perpendicular to the combustion reaction surfaces 11a, 13a of the catalysts 11, 13 is provided between them.

As shown in FIGS. 4 and 5 (a), the heat-radiating fin 93 is provided between the catalyst 11 and the catalyst 13,
It is arranged with a gap with respect to 13 and is fixed to the inner wall of the combustion cylinder 9. This heat radiation fin 93 is shown in FIG.
As shown in FIG. 3, the outer peripheral wall is a cylindrical shape having an outer diameter substantially equal to the inner diameter of the combustion cylinder 9, and the outer peripheral walls are the combustion reaction surfaces 11 a, 1 of the catalysts 11, 13.
An uneven portion 95 is formed over the entire circumference in a direction perpendicular to 3a. Therefore, the total surface area of the fin 93 is increased. In addition, the mixed gas flowing from the premixing unit 5 flows upward in the uneven portion 95.

According to this embodiment, the same effect as that of the first embodiment can be obtained, and the catalyst 1 increased by the combustion reaction of the mixed gas.
The heat of 1 and 13 is efficiently transmitted to the combustion cylinder 9 via the fins 93 for heat radiation. Since the heat transferred to the combustion cylinder 9 is arranged in the air flow path of the fan 77, the amount of heat transferred from the combustion cylinder 9 to the air increases, and as a result, the heat in the combustion cylinder 9 is transferred. The temperature can be lowered to prevent the catalysts 11 and 13 from overheating. Therefore, the combustion range is expanded and the combustion efficiency for one catalyst is increased.

Next, a modification of the second embodiment will be described with reference to FIG. The catalytic combustion device 97 of this embodiment is an example in which the upstream side catalyst 87 is a conductive self-heating type catalyst.

As shown in FIG. 6, one end of an electrode 89 is connected to the downstream catalyst 13 side of the upstream catalyst 87 facing the premixing section 5. The other end of the electrode is drawn out of the cylindrical body 67 and connected to a power source (not shown). Also,
In the catalytic combustion device 97 of this embodiment, no heater is provided inside the blower pipe 27. Also in the present embodiment, as in the above-described embodiment, the heat of the catalysts 11 and 13 increased by the combustion reaction of the mixed gas is transferred to the combustion tube 9 via the heat radiation fins 93.
Be efficiently transmitted to. Since the heat transferred to the combustion cylinder 9 is arranged in the air flow path of the fan 77,
The heat transfer from the combustion cylinder 9 to the air is increased, and as a result, the temperatures of the catalysts 11 and 13 can be lowered, so that the combustion range is expanded and the combustion efficiency for one catalyst is increased.

Third Embodiment Next, a third embodiment will be described with reference to FIG. The present embodiment is an example in which a fin 99 for heat radiation is provided between the catalysts 11 and 13 so as to be inclined with respect to the combustion reaction surfaces 11a and 13a of the catalysts 11 and 13.

As shown in FIG. 7A, the heat radiation fin 9
The catalyst 9 is arranged between the catalyst 11 and the catalyst 13 with a gap from the catalysts 11 and 13, and is fixed to the inner wall of the combustion cylinder 9. As shown in FIG. 7 (b), the heat radiation fin 99 has a cylindrical shape with an outer diameter substantially equal to the inner diameter of the combustion cylinder 9, and the outer peripheral wall is against the combustion reaction surfaces 11 a, 13 a of the catalysts 11, 13. The concavo-convex portion 100 is formed over the entire circumference in the inclined direction. Therefore, the total surface area of the fin 99 is increased. In addition, the inside of the uneven portion 100 has a premixing portion 5
The mixed gas flowing in from flows upward. In this case, since the uneven portion 100 is inclined, a swirling flow is generated in the mixed gas flowing in the uneven portion 100 and is uniformly distributed on the surface of the catalyst 13.

According to this embodiment, the heat of the catalysts 11 and 13 raised by the combustion reaction of the mixed gas is efficiently transferred to the combustion cylinder 9 via the heat radiation fins 99. The heat transferred to the combustion cylinder 9 is increased in the heat transfer from the combustion cylinder 9 to the air because the combustion cylinder 9 is arranged in the air flow path of the fan 77.
As a result, the temperatures of the catalysts 11 and 13 can be lowered, so that the combustion range is widened and the combustion efficiency for one catalyst is increased.

According to this embodiment, the heat of the catalysts 11 and 13 increased by the combustion reaction of the mixed gas is efficiently transferred to the combustion cylinder 9 via the heat radiation fins 99. Since the heat transferred to the combustion cylinder 9 is arranged in the air flow path of the fan 77, the amount of heat transferred from the combustion cylinder 9 to the air increases, and as a result, the temperature of the catalysts 11 and 13 increases. As a result, the combustion range is widened and the combustion efficiency for one catalyst is increased.

Further, in this embodiment, since the uneven portion 100 is inclined with respect to the reaction surfaces 11a and 13a, a swirling flow is generated in the mixed gas. Therefore, the mixed gas is evenly distributed to the combustion reaction surface 13a of the catalyst 13 and is not locally burned, so that local deterioration of the catalyst 13 can be prevented.

Fourth Embodiment Next, a fourth embodiment shown in FIGS. 8 and 9 will be described. The catalytic combustion apparatus 101 according to the present embodiment has the catalyst 1 on the outer periphery of the combustion cylinder 9.
This is an example in which the heat radiation fins 103 perpendicular to the combustion reaction surfaces 11a and 13a of Nos. 1 and 13 are provided.

As shown in FIGS. 8 and 9 (a), the heat radiating fin 10 is provided on the outer periphery of the combustion cylinder 9 between the catalysts 11 and 13.
3 is provided. The heat radiation fins 103 are provided with a plurality of heat radiation plates 105 protruding radially from the outer periphery of the combustion cylinder 9 at equal intervals over the entire circumference. These heat sinks 1
05 are arranged along the direction perpendicular to the combustion reaction surfaces 11a and 13a of the catalysts 11 and 13, respectively.

According to this embodiment, the reaction heat released by the combustion of the mixed gas is transferred to the combustion tube 9 and then to the heat radiation fin 103. Since the combustion cylinder 9 is arranged in the air flow path of the fan 77, it is possible to increase the air volume to the combustion cylinder 9 and increase the heat transfer to the air by the air blown by the fan 77. In this case, in this embodiment, the combustion cylinder 9
Since the heat dissipation fins 103 are provided on the outer periphery of the combustion cylinder 9, the surface area of the combustion cylinder 9 is increased, and the heat in the combustion cylinder 9 can be effectively transferred to the combustion cylinder 9, and the heat of the combustion cylinder 9 can be efficiently transferred. It can be transmitted to well-ventilated air. As a result,
It is possible to prevent the temperature in the combustion cylinder 9 from decreasing and prevent the catalysts 11 and 13 from overheating. Therefore, the combustion range is expanded and the combustion efficiency for one catalyst is increased.

Next, a modification of the fourth embodiment shown in FIG. 10 will be described. The catalytic combustion apparatus 109 of this embodiment is an example in which the upstream side catalyst 87 is a conductive self-heating type catalyst.

As shown in FIG. 10, one end of an electrode 89 is connected to the downstream catalyst 13 side of the upstream catalyst 87 facing the vaporizer 3 of the premixing section 5. The other end of the electrode is a cylinder 6
7 is connected to a power source (not shown). Further, in the catalytic combustion device 109 of this embodiment, no heater is provided in the blower pipe 27. Also in this example, as in the above-described example, since the heat radiation fins 103 are provided on the outer periphery of the combustion tube 9, the heat of the combustion tube 9 can be efficiently transferred to the air that has been blown, and that much. The temperature in the combustion cylinder 9 can be lowered to lower the temperatures of the catalysts 11 and 13. Therefore, the combustion range is expanded, and the combustion efficiency of the catalyst can be increased.

Fifth Embodiment Next, a fifth embodiment shown in FIGS. 11 and 12 will be described. The catalytic combustion apparatus 111 of the present embodiment is an example in which heat radiation fins 113 that are parallel to the combustion reaction surfaces 11a and 13a of the catalysts 11 and 13 are provided on the outer periphery of the combustion cylinder 9.

As shown in FIGS. 11 and 12A and 12B, a plurality of heat radiations are provided on the outer periphery of the combustion cylinder 9 along a direction parallel to the combustion reaction surfaces 11a and 13a of the catalysts 11 and 13. Plates 112 are provided so as to project in multiple stages at predetermined intervals.

According to the present embodiment, as in the above-described respective embodiments, by arranging the combustion cylinder 9 in the air flow path of the fan 77, the air volume to the combustion cylinder 9 is increased and the air from the combustion cylinder 9 is increased. The amount of heat transfer to is increased. In this case, in this embodiment,
Since the heat radiation fins 113 are provided on the outer periphery of the combustion cylinder 9, the surface area of the combustion cylinder 9 is increased, and the heat of the combustion cylinder 9 can be efficiently transmitted to the blown air. The temperature of the inside can be lowered to lower the temperatures of the catalysts 11 and 13. Therefore, the combustion range is expanded and the combustion efficiency can be increased.

Next, a modification of the fifth embodiment shown in FIG. 13 will be described. The catalytic combustion device 115 of the modification is an example in which the upstream side catalyst 87 uses a conductive self-heating type catalyst.

Also in this example, by disposing the combustion cylinder 9 in the air passage of the fan 77, the heat transfer from the combustion cylinder 9 to the air is increased. In this case, in this embodiment, since the heat dissipation fins 113 are provided on the outer periphery of the combustion cylinder 9,
The heat of the combustion cylinder 9 can be efficiently transferred to the blown air, and the temperature in the combustion cylinder 9 is reduced by that amount, so that the catalyst 1
The temperatures of 1 and 13 can be lowered.

[0077]Sixth embodiment  Next, a sixth embodiment shown in FIGS. 14 and 15 will be described.
You. The combustion catalyst device 117 according to this embodiment includes the catalysts 11, 13
An example in which a heat transmission plate 119 is provided on the outer peripheral surface of the combustion cylinder 9 between
You.

As shown in FIG. 14, a heat transmission plate 119 is provided on the outer peripheral surface of the combustion cylinder 9 between the catalysts 11 and 13. The heat transmission plate 119 not only transfers the heat of the combustion cylinder 9, but also has the function of discharging the reaction heat in the combustion cylinder 9 to the outside of the combustion cylinder 9 as radiant heat.

Here, the heat balance in the combustion cylinder 9 will be described with reference to FIG. As shown in FIG. 15, when the catalytic reaction is caused by both the first-stage catalyst 11 and the second-stage catalyst 12 and heat is generated, the catalyst 11
The radiant heat Q1 from the combustion reaction surface S1 and the radiant heat Q2 from the combustion reaction surface S2 of the catalyst 13 exchange heat with each other. The temperatures of the surfaces S1 and S2 have risen due to the heat of reaction, and are higher than that of the inner wall surface S3 of the combustion cylinder 9. The radiant heat is about the fourth power of the temperature difference between the two surfaces, and the amount of radiant heat emitted from the S1 and S2 surfaces to the S3 surface is much larger than the radiant heat between the S1 and S2 surfaces.

For example, when the heat-transmitting plate is not provided, the emissivity of the S3 surface is larger than that when the heat-transmitting plate is provided, and the space surrounded by S1, S2, and S3 approaches the closed system. . The heat generated from the S1 surface and the S2 surface is only due to heat transfer and heat conduction, and the use of the heat-transmitting plate eliminates the amount of heat released to the outside of the combustion cylinder 9, increasing the temperature inside the combustion cylinder. Therefore, the catalyst surfaces S1 and S2
Temperature rises and the amount of combustion decreases in order to keep the catalyst temperature at the catalyst heat resistant temperature. However, by providing the heat transmission plate 119 on the outer peripheral portion of the combustion cylinder 9, not only heat transfer but also heat can be released to the outside of the combustion cylinder 9 as radiation, and the temperature inside the combustion cylinder 9 is lowered, It is possible to prevent overheating of the catalyst. Therefore, the combustion range becomes large.

According to this embodiment, as in each of the above-described embodiments, by disposing the combustion cylinder 9 in the air passage of the fan 77, the amount of heat transfer from the combustion cylinder 9 to the air is increased. Further, in the present embodiment, the heat transmission plate 119 is provided on the outer peripheral surface of the combustion tube 9.
Since the above is provided, the heat of the combustion cylinder 9 can be released not only as heat transfer and heat conduction but also as radiant heat. Therefore, the temperature in the combustion cylinder 9 can be reduced to prevent the catalysts 11 and 13 from overheating. Therefore, the combustion range is expanded, and the combustion efficiency of the catalyst can be increased.

Next, a modification of the sixth embodiment shown in FIG. 16 will be described. The catalytic combustion device 121 of the present embodiment is an example in which the upstream side catalyst 87 is a conductive self-heating type catalyst. Also in this example, the heat transmission plate 11 is provided on the outer peripheral portion of the combustion tube 9.
By providing 9, the heat can be released not only as heat transfer but also as radiation to the outside of the combustion cylinder 9, and the catalysts 11, 1
Since the overheating of No. 3 can be prevented, the combustion range is expanded.

Seventh Embodiment Next, a seventh embodiment will be described with reference to FIG. The catalytic combustion device 123 of this embodiment is an example in which the combustion cylinder 9 between the catalysts 11 and 13 is formed of a heat permeable material 125.

According to this embodiment, the heat of the combustion cylinder 9 can be released not only as heat transfer but also as the radiant heat to the outside of the combustion cylinder 9, and the heat in the combustion cylinder 9 can be efficiently released to the outside. As a result, it is possible to prevent the catalysts 11 and 13 from overheating.

Next, a modification of this embodiment will be described with reference to FIG. The catalytic combustion device 127 of the present modification is such that the combustion catalyst device 127 of the present embodiment uses the upstream catalyst 87 as
This is an example using a conductive self-heating type catalyst.

According to the present embodiment, by disposing the combustion cylinder 9 in the air flow path of the fan 77, the amount of heat transferred from the combustion cylinder 9 to the air is increased. Further, in this embodiment, the catalyst 1
Since the combustion cylinder 9 between Nos. 1 and 13 is formed of the heat permeable material 125, the heat of the combustion cylinder 9 is not only transferred and transferred,
It can be released as radiant heat. Therefore, the combustion cylinder 9
The internal temperature can be lowered to prevent the catalysts 11 and 13 from overheating. Therefore, the combustion range is expanded, and the combustion efficiency of the catalyst can be increased.

Also in this example, the combustion cylinder 9 can not only transfer heat but also release heat to the outside of the combustion cylinder 9 as radiant heat, and the heat of the combustion cylinder 9 can be effectively transferred by the blown air. Therefore, the temperature in the combustion cylinder 9 can be lowered and the catalysts 11 and 13 can be prevented from overheating.

Eighth Embodiment Next, an eighth embodiment will be described with reference to FIG. In the catalytic combustion device 129 of this embodiment, the combustion cylinder 9 between the catalysts 131 and 13 is formed of the heat permeable material 125, and the central portion of the catalyst 131 projects toward the downstream side in the flow direction of the mixed gas. This is an example in which the cross section is formed in a mountain shape.

According to the present embodiment, as in each of the above-described embodiments, by disposing the combustion cylinder 9 in the air passage of the fan 77, the amount of heat transfer from the combustion cylinder 9 to the air is increased. Further, in this embodiment, the combustion cylinder 9 between the catalysts 131 and 13 is formed of the heat permeable material 125, and the catalyst 131 has a cross-sectional mountain shape in which the central portion projects toward the downstream side in the flow direction of the mixed gas. Since it is formed, the heat of the combustion cylinder 9 can be released as radiant heat in addition to heat transfer and heat conduction, and the radiant heat from the combustion cylinder 9 to the outside increases. Therefore, the temperature in the combustion cylinder 9 can be reduced to prevent the catalysts 11 and 13 from overheating. Therefore, the combustion range is expanded, and the combustion efficiency of the catalyst can be increased.

Next, a modification of this embodiment will be described with reference to FIG. The catalytic combustion device 127 of the present modification is such that the combustion catalyst device 127 of the present embodiment uses the upstream catalyst 87 as
This is an example using a conductive self-heating type catalyst.

Also in this embodiment, as in the above embodiment, the upstream side catalyst 131 is formed in a mountain-shaped cross section, so that the radiant heat from the combustion cylinder 9 to the outside increases and the catalysts 11 and 13 are prevented from overheating. Can be done and the combustion range is increased.

[0092]

As described above, according to the invention of claim 1, the temperature of the catalyst can be lowered by controlling the amount of heat generated by the reaction of the catalyst by the control means, thereby preventing overheating, The combustion efficiency can be improved.

According to the invention of claim 2, the heat of combustion reaction released by the combustion reaction of the catalyst and the mixed gas is controlled by using a part of the blown air of the blower means.
Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the third aspect of the present invention, the heat generation amount of the combustion reaction heat released by the combustion reaction between the catalysts in a plurality of stages and the mixed gas is controlled by the control means. Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the invention of claim 4, the heat of combustion reaction released by the combustion reaction of the catalyst and the mixed gas is controlled by using a part of the blown air of the blower means.
Therefore, the temperature in the combustion cylinder can be lowered, and the catalyst does not overheat.

According to the fifth aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blowing means and disposing the heat radiation fins between the catalysts, the heat of the combustion cylinder is efficiently transferred to the blown air. The temperature of the catalyst can be lowered.

According to the sixth aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blowing means and disposing the heat radiation fins between the catalysts, the heat of the combustion cylinder is efficiently transferred to the blown air. The temperature of the catalyst can be lowered.

According to the seventh aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blowing means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat transfer to the air can be achieved. Will increase. Further, by providing a heat radiation fin perpendicular to the reaction surface of the catalyst on the outer circumference of the combustion cylinder, heat can be efficiently transferred to the air blown to the outer circumference of the combustion cylinder.

According to the invention of claim 8, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat transfer to the air can be achieved. Will increase. Further, by providing a heat radiation fin parallel to the reaction surface of the catalyst on the outer circumference of the combustion cylinder, heat can be efficiently transferred to the air blown to the outer circumference of the combustion cylinder.

According to the ninth aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat to the air can be transferred. Increased transmission. Further, the heat transmitting plate provided on the outer peripheral surface of the combustion cylinder radiates the heat of the combustion cylinder to the outside as radiant heat. Therefore, the heat of the combustion cylinder is efficiently transferred to the blown air.

According to the tenth aspect of the invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat to the air can be transferred. Increased transmission. Further, by forming the combustion cylinder with a heat-permeable material, the heat of the combustion cylinder is released to the outside as radiant heat. Therefore, the heat of the combustion cylinder can be efficiently transferred to the blown air.

According to the eleventh aspect of the present invention, by disposing the combustion cylinder in the air flow path of the blower means, the heat of the combustion cylinder can be efficiently transferred to the blown air, and the heat to the air can be transferred. Increased transmission. Further, by forming the combustion cylinder with a heat permeable material, the heat of the combustion cylinder is released to the outside as radiant heat, and the heat of the combustion cylinder can be efficiently transmitted to the blown air. Furthermore, by forming the catalyst in a mountain shape in which the central portion projects toward the downstream side in the flow direction of the mixed gas, the radiant heat from the combustion cylinder to the outside increases, and the heat of the combustion cylinder is efficiently transferred to the air. Can be communicated.

[Brief description of drawings]

FIG. 1 is a sectional view showing a catalytic combustion device of a first embodiment according to the present invention.

2A and 2B show a combustion range from a relationship between a combustion amount and an air flow rate, FIG. 2A is a diagram showing a case where the air volume is large, and FIG. 2B is a diagram showing a case where the air volume is small.

FIG. 3 is a sectional view showing a catalytic combustion device of a modified example of the first embodiment.

FIG. 4 is a sectional view showing a catalytic combustion device of a second embodiment.

FIG. 5 shows a combustion tube of a catalytic combustion device of a second embodiment,
(A) is a partially cutaway side view, (b) is a- of (a)
It is sectional drawing cut | disconnected along the a line.

FIG. 6 is a sectional view showing a catalytic combustion device of a modified example of the second embodiment.

7A and 7B show a combustion cylinder of a third embodiment, FIG. 7A is a partially cutaway side view, and FIG. 7B is a plan view.

FIG. 8 is a sectional view showing a catalytic combustion device of a fourth embodiment.

FIG. 9 shows a combustion tube of a catalytic combustion device of a fourth embodiment,
(A) is a partially broken side view and (b) is a plan view.

FIG. 10 is a sectional view showing a catalytic combustion device of a modified example of the fourth embodiment.

FIG. 11 is a sectional view showing a catalytic combustion device of a fifth embodiment.

FIG. 12 shows a combustion cylinder of a catalytic combustion device of a fifth embodiment,
(A) is a partially broken sectional view and (b) is a plan view.

FIG. 13 is a sectional view showing a catalytic combustion device of a modified example of the fifth embodiment.

FIG. 14 is a sectional view showing a catalytic combustion device of a sixth embodiment.

FIG. 15 is an enlarged side view of a part of a combustion cylinder of the catalytic combustion device of the sixth embodiment.

FIG. 16 is a sectional view showing a catalytic combustion device of a modified example of the sixth embodiment.

FIG. 17 is a sectional view showing a catalytic combustion device of a seventh embodiment.

FIG. 18 is a sectional view showing a catalytic combustion device of a modified example of the seventh embodiment.

FIG. 19 is a sectional view showing a catalytic combustion device of an eighth embodiment.

FIG. 20 is a sectional view showing a catalytic combustion device of a modified example of the eighth embodiment.

[Explanation of symbols]

1, 91, 97, 101, 109, 111, 115, 1
17, 121, 123, 127, 129 Combustion catalyst device 5 Premixing section 7 Supply means 9 Combustion cylinder 11 Upstream catalyst 13 Downstream catalyst 15 Blower means 93, 99, 103, 113 Radiating fins 119 Heat transmission plate 125 Heat permeability Material of

Claims (11)

[Claims] 1. A premixing section for uniformly mixing fuel and air to form a mixed gas, a combustion cylinder into which the mixed gas formed by the premixing section flows, a combustion cylinder and the premixing section. A catalytic combustion apparatus comprising: a catalyst that is divided into sections and arranged in the combustion cylinder to allow the mixed gas to flow therethrough; and a control unit that controls the amount of heat generated by the reaction of the catalyst. 2. The invention according to claim 1, wherein the control means controls the blast air of the blast means for exchanging heat with the room air from the combustion gas burned by the catalytic reaction in the combustion cylinder to obtain warm air. A catalytic combustion device characterized by being configured to use a part thereof. 3. A premixing section for uniformly mixing a fuel and air to form a mixed gas, a combustion cylinder into which the mixed gas formed in this premixing section flows, a combustion cylinder and the premixing section. And a plurality of stages of catalysts in which the mixed gas is allowed to flow, and control means for controlling the amount of heat generated by the reaction between the catalysts. apparatus. 4. The invention according to claim 3, wherein the control means controls the blast air of the blast means for exchanging heat with the room air from the combustion gas burned by the catalytic reaction in the combustion cylinder to obtain warm air. A catalytic combustion device characterized by being configured to use a part thereof. 5. The catalyst combustion apparatus according to claim 3 or 4, wherein heat radiating fins perpendicular to the reaction surface of the catalyst are provided between the catalysts in a plurality of stages. 6. The catalyst combustion device according to claim 3 or 4, wherein heat-dissipating fins inclined with respect to a reaction surface of the catalyst are provided between the catalysts in a plurality of stages. 7. The invention according to any one of claims 1 to 4, wherein a heat radiation fin perpendicular to a combustion reaction surface of the catalyst is provided on an outer periphery of the combustion cylinder. And a catalytic combustion device. 8. The invention according to any one of claims 1 to 4, wherein a heat-radiating fin parallel to a combustion reaction surface of the catalyst is provided on an outer periphery of the combustion cylinder. Catalytic combustion device. 9. The catalytic combustion device according to claim 1, wherein a heat permeable plate is provided on an outer peripheral surface of a combustion cylinder between the catalysts. 10. The catalytic combustion device according to claim 1, wherein at least a combustion cylinder between the catalysts is formed of a heat permeable material. 11. The catalytic combustion device according to claim 10, wherein the catalyst is formed in a mountain shape in cross section with a central portion protruding toward the downstream side in the flow direction of the mixed gas.